<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<div id="app">
		<input type="text" v-model="username">
		{{username}}
	</div>
	<script>
		var vm = new VModel({
			id : "app"
			data : {
				username : "abel"
			}
		});
	</script>
</body>
</html>